"Keibetsu Shiteita Aijō" is Japanese idol group AKB48's fifth single, and the third major single released through DefSTAR Records, on April 18, 2007. The title track was sung with 16 members, 14 of whom appeared on the previous single, "Seifuku ga... Wikipedia
Composers: Yoshimasa Inoue and Yasushi Akimoto
Lyricist: Yasushi Akimoto